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solves #2535: Difference Between Element Sum and Digit Sum of an Array in java

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`794`	`794`	`\| 2520 \| [Count the Digits That Divide a Number](https://leetcode.com/problems/count-the-digits-that-divide-a-number) \| [![Java](assets/java.png)](src/CountTheDigitsThatDivideANumber.java) \| \|`
`795`	`795`	`\| 2525 \| [Categorize Box According to Criteria](https://leetcode.com/problems/categorize-box-according-to-criteria) \| [![Java](assets/java.png)](src/CategorizeBoxAccordingToCriteria.java) \| \|`
`796`	`796`	`\| 2529 \| [Maximum Count of Positive Integer and Negative Integer](https://leetcode.com/problems/maximum-count-of-positive-integer-and-negative-integer) \| [![Java](assets/java.png)](src/MaximumCountOfPositiveIntegerAndNegativeInteger.java) \| \|`
`797`		`-\| 2535 \| [Difference Between Element Sum and Digit Sum of an Array](https://leetcode.com/problems/difference-between-element-sum-and-digit-sum-of-an-array) \| \| \|`
	`797`	`+\| 2535 \| [Difference Between Element Sum and Digit Sum of an Array](https://leetcode.com/problems/difference-between-element-sum-and-digit-sum-of-an-array) \| [![Java](assets/java.png)](src/DifferenceBetweenElementSumAndDigitSumOfAnArray.java) \| \|`
`798`	`798`	`\| 2540 \| [Minimum Common Value](https://leetcode.com/problems/minimum-common-value) \| \| \|`
`799`	`799`	`\| 2544 \| [Alternating Digit Sum](https://leetcode.com/problems/alternating-digit-sum) \| \| \|`
`800`	`800`	`\| 2549 \| [Count Distinct Numbers on Board](https://leetcode.com/problems/count-distinct-numbers-on-board) \| \| \|`

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	`1`	`+// https://leetcode.com/problems/difference-between-element-sum-and-digit-sum-of-an-array`
	`2`	`+// T: O(N)`
	`3`	`+// S: O(1)`
	`4`	`+`
	`5`	`+import java.util.Arrays;`
	`6`	`+`
	`7`	`+public class DifferenceBetweenElementSumAndDigitSumOfAnArray {`
	`8`	`+ public int differenceOfSum(int[] nums) {`
	`9`	`+ final int elementSum = Arrays.stream(nums).sum();`
	`10`	`+ final int digitSum = getDigitSum(nums);`
	`11`	`+ return Math.abs(elementSum - digitSum);`
	`12`	`+ }`
	`13`	`+`
	`14`	`+ private int getDigitSum(int[] array) {`
	`15`	`+ int sum = 0;`
	`16`	`+ for (int number : array) {`
	`17`	`+ sum += getDigitSum(number);`
	`18`	`+ }`
	`19`	`+ return sum;`
	`20`	`+ }`
	`21`	`+`
	`22`	`+ private int getDigitSum(int number) {`
	`23`	`+ final String num = number + "";`
	`24`	`+ int sum = 0;`
	`25`	`+ for (int index = 0 ; index < num.length() ; index++) {`
	`26`	`+ int digit = num.charAt(index) - '0';`
	`27`	`+ sum += digit;`
	`28`	`+ }`
	`29`	`+ return sum;`
	`30`	`+ }`
	`31`	`+}`

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